Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconducting Electronics and Cryogenics: Poster Session

TT 31.9: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P1

PrimA-LTD: Magnetic microcalorimeters for primary activity standardization — •Michael Müller, Ria-Helen Zühlke, Peter Kähler, and Sebastian Kempf — Institute of Micro- and Nanoelectronic Systems, Karlsruhe Institute of Technology, Karlsruhe

Magnetic microcalorimeters (MMC) are cryogenic, energy-dispersive single-particle detectors that consist of a paramagnetic temperature sensor which is in strong thermal contact with a particle absorber. The sensor is magnetized by a magnetic field generated by a persistent current in an underlying superconducting pickup coil. The resulting change of sensor magnetization upon an energy input into the detector is read out by a SQUID. Due to their excellent energy resolution as well as the very low threshold, MMCs are a key technology in the frame of the EMPIR-project “PrimA-LTD” aiming to measure decay spectra of several isotopes with unprecedented precision to enable activity standardization for medicine and industry. Within this project we designed three MMC based layouts optimized for measuring the spectra of α-, β- and electron capture-decaying nuclides. We further developed a novel electroplating setup for the microfabrication of highly pure, 3D-structured particle absorbers made of Au to enable fast thermalization of the detector without position dependencies. Moreover, we started to develop a passive persistent current switch for injecting the persistent current allowing for easier detector handling and higher integration density in comparison to conventionally used heat switches. We summarize the present state of the project and outline ongoing next steps.